Electric heater.



Nc. 877,848; PATENTBD JAN. 2 8, i808. E. F. HOSKIN.

BL'EGTRIGfHBATER.

APPLICATION FILED SEPT.19. 17907.v

smarras ni-iriarr onirica.

EDMUND F; HOSKIN, OF EVANSTON, ILLIIS, ASSIGNOR TO THE IIOSKINS COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRIC HE ATER.

Specification of Letters Patent.

Patented Jan. 28,1908.

Application not september 19, i907. seria No. 393.729.

To all whom it may concern:

Beit known that I, IEDMUND F. Hosnnv,

a citizen of they United States, residing atl Evanston, in the county' of Cook and State 'of Illinois, have invented a new and useful in Electric Heaters, of whieli Improvement the following is a specification.

My invention relates to an improved con struction of electric heater and is intended for embodiment in various forms to adapt it for application to different purposes, heating sad-irons,.for heating water-by-immersion therein of the heater, and for use as .a soldering iron, in which lastnamed form of embodiment it is illustrated in the accompanying drawings. i n

Referring' to the drawings, the iirstsix views illustrate the successive steps employe l in constructing one form of soldering iron in accordance with myV invention, Figure 1 showing a section of `the spiral resistancewire used, Fig. 2,`a longitudinal section of the insulating tubing or covering in which the wire is .incased, Fig. 3,.a similar view oi the spnal wire in the insulating tube, Fig. 4, a similar view of the metal handle-tube about Which the insulated spiral section oi' the resistance-wire is coiled and through which its straight terminal-ends are passed, Fig. 5, a view iii elevation of the handle-tube with the aforesaid insulated resistance-wire upon it, and Fig. 6, a view in sectional elevation showing the device of Fig. in a mold in which copper is east about the insulated coil on the tubeto orni the heat-transinitting element, or head, of the implement. Fig. 7 is a broken view in 'sectional elevation of the implement as it Vappears when removed from the mold, and Fig. 8 shows the finished soldering-iron by a view in elevation. Fig. -9 is a view in sectional elevation showing a modiied embodiment of the invention in a soldering iron and illustrating the method of conv structing the modified device.

. ployed, which in the present instance is in Referring particularly to Figs. 1 to 8, inclusive: The resistance conductor 10 eniwiiie-form Yand preferably that forming the subject of Letters Patent ofthe United States No. 811,859, granted February 6, 1905, to A. L. Marsh ior an electric resistance element, iscoiled into a spiral between its ends,

the entire wire being covered by insulation, as by introducing it into a tube 1l, preferably of asbestos. 'llus wire is inserted in to a straight section.

The structure thus produced in the formv represented in Fig. 5 is introduced into a suitable mold 14, which may be best coinposed oi graphite with its chamber in thel form of a soldering-iron head 15, and being properlysupported in the mold the metal (preferably copper) in molten condition is poured into it to form the headby casting. he result is represented in Fig. 7, and on providing a heat-insulating handle'l on the outer end of the tube 12 and extending through it the insulated end-sections of' the wire lOto form the leads for connection with a supply of electric current, theimplement is completed.

Among the advantages of the construction the followingr may be mentioned: By bringing the metal ot' the heat-transmitting,element or head 15 into intimatev close contact with the insulated resistance-conductor, formation of air-spaces is revented, which would incur loss or' heat, w iile the absence of such air-'spaces enables the minimum amount of current to quickly heat the transmitting` elementsulliciently for its purpose; and the head eifectively seals the resistance-conductor against access of air and other gases and 'Water and therefore against their tendency to shunt the current and of oxidizing the conductor with the effect of unduly increasing its resistance. the metal of the head, in casting it, Hows between the turns of the coil in the Wire 10,

thereby bringing it into intimate contact throughout withthe metal to be heated. These saine advantages are attained by the modiiied'construction illustrated inFig. 9, which differs mainly from the construction vhereinbefore .described in* the matter ofin- ,105.

sulating the resistanceconductor 10, and is reduced as follows The inner end of the 1andletube .12 iits over a 'neck 17 extending from one end of a solid c linder 18 of electroinsulating material, suoli7 thereof, leaving a l ystraight. section to extend other straight section ot" As will be observed,

as soapstone, havl iiig 2u Wire-passage 19 ifoimed iongitudinallyv thiough it anti through the neck', and pio- Vided eziteinaily 'with aspiral groove 20 in which the naked iesistanoo-Wiie l() is Wound, one end being passed through the tube and through a Wire-passage 21 iii the nook and upper portion of the body of' the cylinder 1E to be spimily Wound about the latte?, and the other emi of the Wire Vbeing run tiioug'h the passage 19 :md tube to afford the leads, The Wire-Wound Cyiindei is inti'oduced into a cup-like shell 2) of insulating material such as soapstone or taie, in which it fits oiose'y, vbeing secured thei'eiii by o, @over 523 seating; in the open end ot the @up about the tubo l2 against the ojyfiiiidepend m51 secured in pia-oe, as oemoiitiiig it with silicate ot sodau oi' other suitable med-limi,

The head 'i5 is formed on this modified str tuie in the sii-me Way' as aireody de sciibed, mimei'y by introducing the puits on the stom oi` tube i2 into a mold ifi und Gast ing the metal about them, awcoi'ding to the 'representation iii ig.

Thot einiiii its new, omi desirs to seouie lby Letters steiit, ls-- 1. in electric heetef comprising, iii combination, si intuitie-stem :i soiled iiisuifiteit resistaneeavire on sai-iti stem and having its cust `about said 'wiie iii intimate ooiitset with the instit-ation thereon.

i ting head formed about s ends extended :tiene the sameoiiimig texi I m1112115, and f1 metal heattmiisniitting head if. in oleo mi@ heater coiiiprisiiig, iii combination, aV tubuiar haiiciie-stem) a coiled insu f lated iesistance-. fe ou said stem sind han@ 111g its ends' extentie@ tnrougn the simio toim ing teiuimz'zis, mida metal heat-transmitting hemd cast about seid. stem Mid wire in 1i1ti about said sh l :om piisiim iii combi:

4. .fiiieioct ie-ii" .W "on, a. ti'lffiiit lie-'L Host/em, :i body' ot iin-- sulfgi iiw' ninteiisi in" 'EN a, neck about which seid n' ii-ts one fi zuid provided with am extei spiral Yi'ooe, im electric i'e sistzmce wire tieni.' ig terminal onli sections exteiidi i; througn stom will wound be tween sind sections into smid groove, a, stie ot insulating umteiial in which ssii vfie- Wound body comi" ed', it iwf-i iii-minet? salty; tod. iii the open, und oi stie'li About seid neck, and 2L metal iientetiansniit- 'd siiei. ELDM ifi) i", HUSKN Iii presence oir# 1R. A. Semitism,

WT." Tl JONES. 

